With Great Success of the ISR V3 SR20DET Manifold we have released a brand new High-quality SCH40 RamHorn Top Mount Manifold with 38mm MVS wastegate. The ISR RamHorn Manifold is an upgrade over almost all other bottom and top mount manifolds, Utilizing thicker Schedule 40 Weld-El Piping and allows room for A/C and powersteering.